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Finding the Fourth Proportional to 320.11, 480.19 and 103.70

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Solution

The fourth proportional to 320.11, 480.19 and 103.70 is: 155.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    320.11 : 480.19 = 103.70 : x
  2. Step 2: Convert to fraction form
    320.11/480.19 = 103.70/x
  3. Step 3: Cross multiply
    320.11x = 480.19 × 103.70
  4. Step 4: Simplify right side
    320.11x = 49,793.30
  5. Step 5: Solve for x
    x = 49,793.30/320.11
  6. Step 6: Final answer
    x = 155.55

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.